Three-dimensional printing with detector solutions

Abstract

This disclosure describes multi-fluid kits for three-dimensional printing, three-dimensional printing kits, and methods of testing powder bed material for contamination. In one example, a multi-fluid kit for three-dimensional printing can include a fusing agent and a detector solution. The fusing agent can include water, an electromagnetic radiation absorber, and a first pigment reactant. The electromagnetic radiation absorber can absorb radiation energy and convert the radiation energy to heat. The detector solution can include water and a second pigment reactant. The second pigment reactant can be reactive with the first pigment reactant to form a colored pigment.

1 . A multi-fluid kit for three-dimensional printing, the multi-fluid kit comprising:
 a fusing agent comprising:
 water; 
 an electromagnetic radiation absorber that absorbs radiation energy and converts the radiation energy to heat; and 
 a first pigment reactant; and 
   a detector solution comprising water and a second pigment reactant, wherein the second pigment reactant is reactive with the first pigment reactant to form a colored pigment.   
     
     
         2 . The multi-fluid kit of  claim 1 , wherein the first pigment reactant or the second pigment reactant is selected from the group consisting of NH 4 Fe(SO 4 ) 2 ·12H 2 O, (NH 4 ) 2 Fe(SO 4 ) 2 ·6H 2 O FeSO 4 , NaOH, Na 2 SO 4 , BaCl 2 , CuSO 4 , NaHCO 3 , Na 2 CO 3 , Na 2 CrO 4 , K 2 CrO 4 , ZnSO 4 , ZnCl 2 , K 3 [Fe(CN) 6 ], K 4 [Fe(CN) 6 ], and a combination thereof. 
     
     
         3 . The multi-fluid kit of  claim 1 , wherein the first pigment reactant is NH 4 Fe(SO 4 ) 2 ·12H 2 O and the second pigment reactant is K 4 [Fe(CN) 6 ]. 
     
     
         4 . The multi-fluid kit of  claim 1 , wherein the first pigment reactant is present in the fusing agent in an amount ranging from about 0.01 wt % to about 2 wt %. 
     
     
         5 . The multi-fluid kit of  claim 1 , wherein the fusing agent is a colorless fusing agent or a low tint fusing agent. 
     
     
         6 . The multi-fluid kit of  claim 1 , further comprising a detailing agent comprising a detailing compound, wherein the detailing agent also includes the first pigment reactant. 
     
     
         7 . A three-dimensional printing kit, comprising:
 a powder bed material comprising polymer particles;   a fusing agent to be selectively applied to the powder bed material, the fusing agent comprising water and an electromagnetic radiation absorber, wherein the electromagnetic radiation absorber absorbs electromagnetic radiation energy and converts the electromagnetic radiation energy to heat; and   a detailing agent to be selectively applied to the powder bed material, the detailing agent comprising a detailing compound to reduce a temperature of powder bed material onto which the detailing agent is applied;   a first pigment reactant in the fusing agent, or in the detailing agent, or both; and   a detector solution comprising water and a second pigment reactant, wherein the second pigment reactant is reactive with the first pigment reactant to form a colored pigment.   
     
     
         8 . The three-dimensional printing kit of  claim 7 , wherein the polymer particles are selected from the group consisting of polyamide 6 particles, polyamide 9 particles, polyamide 11 particles, polyamide 12 particles, polyamide 66 particles, polyamide 612 particles, polyamide copolymer particles, polyethylene particles, thermoplastic polyurethane particles, polypropylene particles, polyester particles, polycarbonate particles, polyether ketone particles, polyacrylate particles, polystyrene particles, polyvinylidene fluoride particles, poly(vinylidene fluoride-trifluoroethylene) particles, poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) particles, wax particles, and a combination thereof. 
     
     
         9 . The three-dimensional printing kit of  claim 7 , wherein the first pigment reactant is NH 4 Fe(SO 4 ) 2 ·12H 2 O and the second pigment reactant is K 4 [Fe(CN) 6 ]. 
     
     
         10 . The three-dimensional printing kit of  claim 7 , wherein the first pigment reactant is in the fusing agent and is present in an amount ranging from about 0.01 wt % to about 2 wt %. 
     
     
         11 . The three-dimensional printing kit of  claim 7 , wherein the fusing agent is a colorless fusing agent or a low tint fusing agent. 
     
     
         12 .- 15 . (canceled) 
     
     
         16 . The multi-fluid kit of  claim 1 , wherein at least one of the first and second pigment reactants includes a metal salt. 
     
     
         17 . The multi-fluid kit of  claim 6 , wherein the first pigment reactant is present in the detailing agent in an amount ranging from about 0.01 wt % to about 2wt %. 
     
     
         18 . The three-dimensional printing kit of  claim 7 , wherein the first pigment reactant is in the detailing agent and is present in an amount ranging from about 0.01 wt % to about 2 wt %. 
     
     
         19 . The three-dimensional printing kit of  claim 7 , wherein at least one of the first and second pigment reactants includes a metal salt. 
     
     
         20 . The three-dimensional printing kit of  claim 7 , wherein the first pigment reactant or the second pigment reactant is selected from the group consisting of NH 4 Fe(SO 4 ) 2 ·12H 2 O, (NH 4 ) 2 Fe(SO 4 ) 2 ·6H 2 O FeSO 4 , NaOH, Na 2 SO 4 , BaCl 2 , CuSO 4 , NaHCO 3 , Na 2 CO 3 , Na 2 CrO 4 , K 2 CrO 4 , ZnSO 4 , ZnCl 2 , K 3 [Fe(CN) 6 ], K 4 [Fe(CN) 6 ], and a combination thereof.